CN114367702A

CN114367702A - Reciprocating saw

Info

Publication number: CN114367702A
Application number: CN202011107686.6A
Authority: CN
Inventors: 张伟; 徐中全; 张锐
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2020-10-16
Filing date: 2020-10-16
Publication date: 2022-04-19

Abstract

The invention discloses a reciprocating saw, comprising: a housing; a functional assembly comprising: a motor supported by the housing; the sliding rod is used for connecting and driving the saw blade; the transmission mechanism is connected with the motor and the slide bar and can drive the slide bar to reciprocate; the reciprocating saw further comprises: a connecting device configured to rotatably connect the functional device to the housing; and the buffer piece is arranged between the functional component and the shell. The invention can improve the cutting efficiency of the reciprocating saw, reduce the vibration of the reciprocating saw and prolong the service life of the reciprocating saw.

Description

Reciprocating saw

Technical Field

The invention relates to an electric tool, in particular to a reciprocating saw.

Background

The reciprocating saw realizes cutting operation by driving the saw blade to reciprocate. Vibration is always a difficult problem to solve for reciprocating saws, can not effectively reduce the vibration of the reciprocating saw, can reduce the use hand feeling of users, and is not beneficial to the health of the users. How to improve reciprocating saw efficiency, reduce reciprocating saw's vibration is the problem that is difficult to solve, and correspondingly, traditional vibration isolation method to reciprocating saw may make reciprocating saw's cutting maneuverability not good, or can not effective damping. Meanwhile, in order to improve the efficiency of the reciprocating saw, the traditional means is difficult to avoid increasing the size of the whole reciprocating saw, and the portability of the reciprocating saw is not utilized.

Disclosure of Invention

To overcome the deficiencies of the prior art, the present invention is directed to improving the cutting efficiency of a reciprocating saw, reducing the vibration of the reciprocating saw, and extending the life of the reciprocating saw.

In order to achieve the above object, the present invention adopts the following technical solutions: a reciprocating saw is proposed, comprising: a housing; a functional assembly comprising: a motor supported by the housing; the sliding rod is used for connecting and driving the saw blade; the transmission mechanism is connected with the motor and the slide bar and can drive the slide bar to reciprocate; the reciprocating saw further comprises: a connecting device configured to rotatably connect the functional device to the housing; and the buffer piece is arranged between the functional component and the shell.

Optionally, the functional assembly is rotatable around a first straight line relative to the housing; the reciprocating saw has a cutting plane, and the first line is perpendicular to the cutting plane.

Optionally, the transmission mechanism comprises: the drive wheel is rotated by motor drive, and the balancing piece is connected with the drive wheel, and first eccentric structure connects slide bar and drive wheel, and the drive wheel can drive the slide bar through first eccentric structure along first direction and second direction reciprocating motion, and when the slide bar moved to first direction, the balancing piece moved along the second direction opposite with first direction.

Optionally, the damping member is elastically deformable at least in a direction of a second line perpendicular to the first line during operation of the reciprocating saw.

Optionally, the functional assembly further comprises a gear box supporting the transmission mechanism, and the buffer member is disposed between the gear box and the housing.

Optionally, the balance block is eccentrically disposed on the driving wheel, and rotates synchronously with the driving wheel.

Optionally, the transmission assembly further comprises: and the second eccentric structure is connected with the balance block, and when the sliding rod moves towards the first direction, the second eccentric structure drives the balance block to move along a second direction opposite to the first direction.

Optionally, the motor includes a motor shaft rotating along a first axis, the first axis is perpendicular to the first line and the first direction, and an axial distance between the balance weight and the sliding rod along the first axis is greater than 10 mm.

Optionally, the buffer member is one or a combination of a sponge, a rubber or a spring, and the buffer member has a first buffer surface contacting with the shell and a second buffer surface contacting with the functional component.

Optionally, the connecting means comprises: the fixed piece and the rotating piece are connected with the fixed piece in a rotating mode, and the fixed piece and the rotating piece are fixedly connected with the gear box and the shell respectively.

Optionally, when the sliding rod moves along the second direction, the sliding rod slides into the housing, and the front end of the sliding rod moves downward.

The invention has the advantages that: through the cooperation of connecting device and buffer, spacing through connecting device, utilize the reciprocating saw to realize lifting the sword of reciprocating saw at the vibration that transmission in-process produced, promoted cutting efficiency to through the buffering of bolster, reduce the vibration of shell, prolong reciprocating saw's life has promoted user's use and has felt.

Drawings

Fig. 1 is a schematic perspective view of a reciprocating saw as a first embodiment;

FIG. 2 is an internal block diagram of the reciprocating saw of FIG. 1;

FIG. 3 is a cross-sectional schematic view of the reciprocating saw of FIG. 1;

FIG. 4 is a schematic structural view of functional components of the reciprocating saw of FIG. 1;

FIG. 5 is a schematic view showing the internal structure of a reciprocating saw of the first embodiment;

FIG. 6 is a schematic view showing an internal structure of a reciprocating saw as a second embodiment;

FIG. 7 is a schematic view showing an internal structure of a reciprocating saw according to a third embodiment;

FIG. 8 is a schematic sectional view of a reciprocating saw as a fourth embodiment;

FIG. 9 is a schematic view of the trajectory of the leading end of the slide bar of the reciprocating saw of the present invention during operation.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

The present invention provides a reciprocating saw 100 for use with a cutting tool. The invention is described in detail below with reference to the figures and the embodiments.

Referring to fig. 1 to 3, an embodiment of the present invention provides a reciprocating saw 100 including a housing 110 and a functional assembly 200, the functional assembly 200 being capable of performing a cutting function of the reciprocating saw 100. The functional assembly 200 includes a motor 210, a sliding rod 220 and a transmission mechanism 230, wherein the sliding rod 220 is used for connecting and driving the saw blade to reciprocate. The motor 210 is supported by the housing 110, a gap exists between the motor 210 and the housing 110 or an elastic element is arranged between the motor 210 and the housing 110, the transmission mechanism 230 is connected with the motor 210 and the sliding rod 220, and the sliding rod 220 is driven to reciprocate by the transmission mechanism 230. The reciprocating saw 100 further comprises a coupling device 120 configured to rotatably couple the functional device 200 to the housing 110, the coupling device 120 being rotatable about a central axis extending along the first line 103, and a bumper 130. The buffer member 130 is disposed between the functional assembly 200 and the case 110. When the reciprocating saw 100 operates, the motor 210 drives the sliding rod 220 to reciprocate along the first direction 101 and the second direction 102 through the transmission mechanism 230, the transmission mechanism 230 generates vibration when transmitting power of the motor 210, so that the functional component 200 swings around the first straight line 103 relative to the housing 110, at this time, the sliding rod 220 swings around the first axis 105 along with the functional component 200 and drives the saw blade to swing along with the first axis, thereby improving cutting efficiency of the saw blade, meanwhile, the buffer member 130 arranged between the functional component 200 and the housing 110 buffers the functional component 200, thereby reducing impact force between the functional component 200 and the housing 110, and reducing vibration of the housing 110.

Referring to fig. 3 and 5, the connecting device 120 includes a rotating member 121 and a fixing member 122, the fixing member 122 is fixedly connected to the functional module 200, and the rotating member 121 is fixedly connected to the housing 110. The fixing member 122 has a pin hole formed therein, and the rotating member 121 passes through the pin hole so that the functional module 200 can rotate about the first line 103 with respect to the housing 110. Alternatively, the fixed member is fixedly connected to the housing, and the rotating member 121 is fixedly connected to the functional unit.

Alternatively, the fixed member 122 and the rotating member 121 may be fixedly connected with each other in the direction in which the first straight line 103 extends, i.e., the fixed member 122 and the rotating member 121 cannot be displaced from each other. The reciprocating saw has a cutting plane 106 along which the blade extends when mounted to the front end of the slide bar 220, a first line perpendicular to the cutting plane, and the functional assembly is constrained against movement relative to the housing in a translational direction of the cutting plane. During operation of the reciprocating saw, the transmission mechanism 230 can drive the sliding rod 220 to swing around the first straight line 103 in a direction parallel to the cutting plane 106, and the sliding rod 220 is driven to reciprocate along a first direction and a second direction parallel to the cutting plane 106.

Alternatively, a buffer member, which may be an elastic member, is provided between the fixed member 122 and the rotating member 121 in the direction in which the first straight line 103 extends.

Referring to fig. 3 and 4, the transmission mechanism 230 includes a transmission wheel 231, a balance weight 232, and a first eccentric structure 233, the motor 210 has a motor shaft 211 along the first axis 105, and the transmission wheel 231 is engaged with the motor shaft 211 to be driven to rotate by the motor 210. The balance weight 232 is connected with the transmission wheel 231, the first eccentric structure 233 is connected with the sliding rod 220 and the transmission wheel 231, and the transmission wheel 231 can drive the sliding rod 220 to reciprocate along the first direction 101 and the second direction 102 through the first eccentric structure 233. When the slide bar 220 moves in the first direction 101, the weight 232 moves in a second direction 102 opposite to the first direction 101.

The reciprocating saw 100 further includes a sleeve for supporting and restraining the slide bar 220, the slide bar 220 being disposed through the sleeve and restrained by the sleeve to extend in the first direction 101 such that the slide bar 220 can be driven by the transmission mechanism 230 to reciprocate in the first direction 101 and the second direction 102.

The functional assembly 200 further comprises a gearbox 240 for supporting the transmission 230, part of the transmission 230 being arranged in the gearbox 240 and the sleeve also being arranged in the gearbox 240. The fixed piece and the rotating piece are respectively and fixedly connected with the gear box and the shell. Part of the gear train 230 is fixedly connected to the gear box 240 so that the gear train 230 as a whole oscillates synchronously with the gear box 240. The buffer member 130 is disposed between the gear case 240 and the case 110, and the buffer member 130 is an elastic member.

Referring to fig. 9, when the transmission mechanism 230 drives the sliding rod 220 and the balance block 232 to reciprocate, L2 is a displacement track of a position at the front end of the sliding rod when the sliding rod returns, at this time, the sliding rod 220 moves towards the first direction 101, the balance block 232 moves towards the second direction 102 opposite to the first direction 101, at this time, the sliding rod 220 is pulled by the transmission wheel 231 towards the second direction 102, the balance block 232 is pulled by the transmission wheel 231 towards the first direction 101, according to the reaction of the forces, the transmission wheel 231 generates a torque to lift the whole front end of the transmission mechanism 230 upwards, so that the sliding rod 220 drives the saw blade to lift upwards, the saw blade is far away from the workpiece when extending out of the reciprocating saw 100, the resistance on the saw blade is reduced, and the cutting efficiency is improved. L1 is a displacement track at a position of the front end of the slide bar during the cutting process of the slide bar, at this time, the slide bar 220 moves towards the second direction 102, the balance block 232 moves towards the first direction 101, at this time, the driving wheel 231 generates torque to enable the whole front end of the driving mechanism 230 to be pressed downwards, the cutting force acting on the workpiece is increased, and therefore the cutting efficiency is improved. The damper 130 is disposed between the housing 110 and the gear case 240, and a plurality of dampers 130 are disposed. The moment generated by the transmission mechanism 230 when the reciprocating saw 100 operates can drive the gear box 240 to swing relative to the housing 110, and the buffer member 130 can allow the gear box 240, the transmission mechanism 230 and the sliding rod 220 to swing integrally relative to the housing 110 and buffer the gear box 240, so that the vibration of the housing 110 is avoided, and the use feeling of a user is improved.

Alternatively, the coupling means is arranged to couple the gearbox and the housing such that the gearbox and the housing are rotationally coupled relative to each other. The connecting device can be set into conical bodies arranged on two sides of the gear box, and the groove limiting connecting device is arranged inside the shell, so that the gear box can rotate around a first straight line relative to the shell.

Optionally, the motor 210 is supported by the gear box 240 and is capable of oscillating with respect to the housing 110 as a unit with the gear box 240, the motor 210, and the slide bar 220 during operation of the reciprocating saw 100. Alternatively, when the motor 210 is an inner rotor motor 210, the buffer 130 may be directly disposed between the motor 210 and the housing 110, and the buffer 130 is disposed between the gear box 240 and the housing 110.

In one embodiment, the reciprocating saw further comprises a motor housing disposed outside the motor, the motor housing and the housing being directly provided with a buffer member, the motor housing and the motor being synchronously swingable relative to the housing, and the buffer member damping the motor.

The first eccentric structure 233 includes a transmission member 2331, the transmission member 2331 is disposed at one side of the transmission wheel 231 and eccentrically connected to the transmission wheel 231, one side of the slide bar 220 is provided with a guide groove 221, and the guide groove 221 extends along a straight line perpendicular to the first direction 101, so that when the reciprocating saw 100 is operated, the rotating transmission member 2331 is movable in the guide groove 221 in a direction perpendicular to the first direction 101 and drives the guide groove 221 and the slide bar 220 to reciprocate along the first direction 101 and the second direction 102 together.

The transmission mechanism 230 further comprises a transmission shaft, the transmission shaft is engaged or connected with the transmission wheel 231, so that the transmission wheel 231 can drive the transmission shaft to rotate. The transmission mechanism further includes a second eccentric structure 250, the transmission wheel 231 is connected to the balance weight 232 through the second eccentric structure 250, and when the sliding rod 220 moves in the first direction 101, the second eccentric structure 250 drives the balance weight 232 to move in a second direction 102 opposite to the first direction 101. The second eccentric structure 250 includes a cam 251, the cam 251 is disposed at one end of the driving shaft, and the cam 251 and the driving shaft are eccentrically coupled. The balance weight 232 is provided with a guide hole 2321, and the cam 251 rotates in the guide hole 2321 and can drive the balance weight 232 to reciprocate in the first direction 101 and the second direction 102, which is not described in detail herein.

Optionally, the sliding rod 220 is disposed on the upper side of the driving wheel 231, the balance weight 232 is disposed on the lower side of the driving wheel 231, and an axial distance between the balance weight 232 and the sliding rod 220 along the second straight line 104 is greater than 10mm and less than or equal to 18 mm. The farther the distance between the balance weight 232 and the sliding rod 220 is, the longer the force arm is, the larger the torque is, the cutting efficiency can be increased, and in order to ensure the compact size of the whole machine, the distance between the balance weight 232 and the sliding rod 220 cannot be overlong. Optionally, the first axis 105 of the motor shaft 211 of the motor 210 is parallel to the first direction 101, and the projected portion of the weight 232 and the motor 210 overlap in a radial direction of the first direction 101.

The second straight line 104 extends in the up-down direction of the reciprocating saw 100, the buffering member 130 is elastically deformed at least in the direction of the second straight line 104 perpendicular to the first straight line 103 when the reciprocating saw 100 is in operation, and the buffering member 130 is disposed above and below the functional element. The buffer 130 is one or a combination of a sponge, rubber, or a spring.

When the reciprocating saw 100 runs, the functional assembly 200 swings around the rotation center, so that part of the functional assembly 200 is close to the shell 110 upwards, part of the functional assembly 200 is close to the shell 110 downwards, the buffer members 130 arranged above and below the functional element buffer the functional assembly 200, so that the buffer members 130 are compressed on a second straight line 104 perpendicular to the first straight line 103, and part of stored energy is released when the functional element returns, so that the cutter lifting of the reciprocating saw 100 during running is realized, and the cutting efficiency of the reciprocating saw 100 is improved.

Optionally, the buffering members 130 are disposed between the gear case 240 and the housing 110, and disposed at the upper side and the lower side of the gear case 240, respectively, and disposed at the front portion and the rear portion of the gear case 240, when the sliding rod 220 moves along the second direction 102, the sliding rod 220 slides towards the inside of the housing, the front end of the sliding rod 220 moves downwards, so that the sliding rod 220 can move the saw blade downwards, and at this time, the rear end of the transmission mechanism 230 moves upwards, and the buffering members 130 disposed at the upper side and the lower side of the gear case 240 buffer the gear case 240. Here, the front end of the slide bar 220 refers to a direction of a position where the slide bar mounts the saw blade, i.e., the saw blade can be mounted to the front end of the slide bar 220.

Alternatively, referring to fig. 5, the buffer member 130 has a first buffer surface 131 contacting the case 110 and a second buffer surface 132 contacting the functional assembly 200, and compresses the buffer member 130 while the functional assembly 200 moves in the direction of the second line 104. In another embodiment, the buffer member 130 is disposed in contact with the housing 110, and a gap is formed between the buffer member 130 and the surface of the gear box 240, and in another embodiment, the buffer member 130 is disposed on the surface of the gear box 240, and a gap is formed between the buffer member 130 and the housing 110 and the gear box 240. In one embodiment, a portion of the buffer 130 is disposed to contact the housing 110 and the gear case 240, respectively, and a portion of the buffer 130 is disposed to have a gap with the housing 110 or the gear case 240. Therefore, after the reciprocating saw 100 is used for a long time, part of the buffer member 130 transmits plastic deformation, and part of the buffer member 130 is still left to effectively buffer the functional assembly 200.

In one embodiment, referring to fig. 6, the buffer 130a includes a first buffer 133a and a second buffer 134a, and the hardness of the first buffer 133a is less than that of the second buffer 134 a. The first buffer 133a and the second buffer 134a are arranged overlapping in the direction of the second straight line, i.e. the projections of the first buffer 133a and the second buffer 134a onto the second straight line at least partly overlap,

because of the characteristics of the cushion member 130a, the lower the hardness of the cushion member 130a, the better the damping effect is generally, but the lower hardness cushion member 130a is more likely to reach the limit position, i.e., once the amplitude of the reciprocating saw exceeds the limit position corresponding to the cushion member 130a, the vibration of the reciprocating saw portion cannot be damped, and thus the upper limit of the damping using the separate low hardness cushion member 130a is lower. The high-hardness damper 130a has a high upper limit of damping, but has a general damping effect, and is suitable for damping a reciprocating saw having a large amplitude or a heavy load. In order to solve the limitation of the damping process of the two characteristic damping members 130a, the first damping member 133a and the second damping member 134a are arranged to have different hardness, wherein preferably, the ratio of the hardness difference between the first damping member 133a and the second damping member 134a to the hardness of the first damping member 133a is 0.3 to 0.8, so that the first damping member 133a and the second damping member 134a with the hardness difference are matched, the working condition of the reciprocating saw with large amplitude or small amplitude can be damped and buffered, the upper damping limit is improved, and the service life of the reciprocating saw is prolonged. It is understood that the hardness of the above buffer 130a is shore hardness, and other hardness standards are also possible, and are not limited herein.

Alternatively, referring to fig. 7, the weight 232b is eccentrically disposed on the driving wheel 232b, and the weight 232b is set to have a certain weight and rotates in synchronization with the driving wheel 232 b. The drive wheel 232b can be driven by a motor to rotate about a second axis. The transmission member 2331b has one end disposed in the guide groove and the other end connected to the driving wheel 232 b. In the radial direction of the second axis, the balance block 232b and the driving wheel 232b are disposed on the surface of the driving wheel 232b and far away from the second axis, and the balance block 232b and the driving wheel 232b are disposed oppositely, so that when the driving wheel 232b rotates, the driving wheel 232b drives the slide rod and the balance block 232b to move in opposite directions through the transmission member 2331b, thereby reducing the vibration generated during the operation of the reciprocating saw.

Alternatively, referring to FIG. 8, the motor 210c includes a motor shaft 211c that rotates along a first axis 105c, the first axis 105 being perpendicular to the first line and the first direction and parallel to the second line 104, in which case the reciprocating saw may be configured as a single-handed saw. The load of singlehanded reciprocating saw is less, and the user one-hand operation of being convenient for, and this scheme can promote singlehanded reciprocating saw cutting efficiency through the sword of lifting of saw bit. All embodiments of the present invention may also be applied to a two-handed reciprocating saw, without limitation.

Optionally, an extension piece is arranged between the casing and the buffer piece, the extension piece may be a gasket and may be made of hard material, and the gasket may be integrally formed or connected with the casing, so that the buffer piece is convenient to arrange. Similarly, an extension member may be provided between the functional component and the cushioning member. The extension member may also be provided as an auxiliary housing covering the electric wire.

It will be appreciated that the solution proposed by the present invention can also be applied to other types of power tools, such as multi-function power tools.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A reciprocating saw, comprising:

a housing;

a functional assembly comprising:

a motor supported by the housing;

the sliding rod is used for connecting and driving the saw blade;

the transmission mechanism is connected with the motor and the slide bar and can drive the slide bar to reciprocate;

characterized in that, the reciprocating saw still includes:

a connecting device configured to rotatably connect the functional device to the housing;

a buffer member disposed between the functional assembly and the case.

2. The reciprocating saw as defined in claim 1, wherein:

the functional component can rotate around a first straight line relative to the shell;

the reciprocating saw has a cutting plane, and the first line is perpendicular to the cutting plane.

3. The reciprocating saw as defined in claim 2, wherein:

the transmission mechanism includes:

the driving wheel is driven by the motor to rotate;

the balance block is connected with the driving wheel;

the first eccentric structure is connected with the sliding rod and the transmission wheel, and the transmission wheel can drive the sliding rod to reciprocate along a first direction and a second direction through the first eccentric structure;

when the slide bar moves to the first direction, the weight moves in the second direction opposite to the first direction.

4. The reciprocating saw as defined in claim 3, wherein: when the reciprocating saw runs, the buffer piece can generate elastic deformation at least in the direction of a second straight line perpendicular to the first straight line.

5. The reciprocating saw as defined in claim 3, wherein:

the functional assembly further comprises a gear box supporting the transmission mechanism;

the damper is disposed between the gear case and the housing.

6. The reciprocating saw as defined in claim 5, wherein:

the connecting device includes:

the fixing piece and the rotation piece, rotate the piece with the fixing piece rotates and is connected, the fixing piece with rotate the piece respectively with the gear box with casing fixed connection.

7. The reciprocating saw as defined in claim 3, wherein:

the transmission assembly further includes: and the second eccentric structure is connected with the balance block, and when the sliding rod moves towards the first direction, the second eccentric structure drives the balance block to move along the second direction opposite to the first direction.

8. The reciprocating saw as defined in claim 7, wherein:

the motor includes a motor shaft that rotates along a first axis, the first axis being perpendicular to the first line and the first direction;

the axial distance between the balance weight and the sliding rod along the first axis is greater than 10 mm.

9. The reciprocating saw as defined in any one of claims 1 to 8, wherein:

the buffer piece is one or a combination of sponge, rubber or a spring, and is provided with a first buffer surface in contact with the shell and a second buffer surface in contact with the functional component.

10. The reciprocating saw as defined in claim 3, wherein:

when the sliding rod moves along the second direction parallel to the cutting plane, the sliding rod slides towards the shell, and the front end of the sliding rod moves downwards.